JP6710337B2 - Air conditioner - Google Patents

Description

The present invention relates to an air conditioner equipped with a turbo fan.

Patent Document 1 describes an air conditioner. This air conditioner has a centrifugal blower and a heat exchanger arranged around the centrifugal blower. An impeller of a centrifugal blower includes a hub attached to a motor shaft, a shroud arranged to face the hub, and a plurality of blades arranged between an outer peripheral portion of the hub and an outer peripheral portion of the shroud. There is. The suction port of the centrifugal blower is formed in the central part of the shroud, and the air outlet of the centrifugal blower is formed in the outer peripheral part of the impeller.

Japanese Patent No. 3092554

In a centrifugal blower, air is sucked into the impeller from the suction port along the axial direction. Therefore, the air sucked into the impeller has momentum in the axial direction from the shroud to the hub. Further, in the case of a low pressure centrifugal blower mounted on an air conditioner, the radial length of the blade is relatively short. Therefore, the air blown from the blower outlet of the centrifugal blower has an air volume distribution that is biased toward the hub side in the axial direction.

The air blown out from the blower outlet of the centrifugal blower flows into a heat exchanger arranged around the centrifugal blower. In general, the heat exchanger is arranged, with respect to the positional relationship in the axial direction, with a bias toward the shroud side rather than the hub side with respect to the outlet of the centrifugal blower. Therefore, the deviation of the air volume distribution of the air flowing into the heat exchanger is larger than the deviation of the air volume distribution of the blown air at the blower outlet of the centrifugal blower.

The heat exchanger provides a resistance to the flow of air. For this reason, when the air with an uneven airflow distribution flows into the heat exchanger, the deviation of the airflow distribution is alleviated with a loss of dynamic pressure. Therefore, the air conditioner described in Patent Document 1 has a problem that the required power becomes large due to a large energy loss.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an air conditioner that requires less power and is excellent in energy saving.

An air conditioner according to the present invention comprises a turbofan having an impeller and a fan motor for driving the impeller, and a heat exchanger arranged on a leeward side of the impeller, wherein the impeller is A main plate connected to the drive shaft of the fan motor, a side plate arranged to face the main plate and having a suction port formed in a central portion, and a plurality of blades provided between the main plate and the side plate. , Each of the plurality of blades has a leading edge and a trailing edge arranged outside the leading edge in the radial direction of the turbofan, and the trailing edge A notch is formed, and each of the plurality of blades is a pair of sides facing each other across the notch, and a first side positioned on the main plate side of the notch and the notch. And a second side located on the side plate side of, and the second side is formed so as to be convex toward the main plate side.

According to the present invention, since the air flow direction along the second side can be bent toward the side plate, it is possible to reduce the deviation in the air flow distribution of the air flowing into the heat exchanger. Therefore, it is possible to reduce the loss of the dynamic pressure generated in the air that is blown out from the impeller and flows into the heat exchanger, so that it is possible to obtain an air conditioner that requires less power and is excellent in energy saving.

It is a schematic diagram which shows the cross-sectional structure of the air conditioner which concerns on Embodiment 1 of this invention. It is a figure which expands and shows the structure of the blade|wing 15 in the air conditioner which concerns on Embodiment 1 of this invention. It is a figure which expands and shows the structure of the blade|wing 15 in the air conditioner which concerns on Embodiment 1 of this invention. It is a figure which shows the positional relationship of the blade|wing 15 and the heat exchanger 20 in the air conditioner which concerns on Embodiment 1 of this invention. It is a figure which shows the 1st modification of a structure of the blade|wing 15 in the air conditioner which concerns on Embodiment 1 of this invention. It is a figure which shows the 2nd modification of a structure of the blade|wing 15 in the air conditioner which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the blade|wing 15 in the air conditioner which concerns on Embodiment 2 of this invention. It is a figure which shows the structure of the blade|wing 15 in the air conditioner which concerns on Embodiment 3 of this invention.

Embodiment 1.
The air conditioner according to Embodiment 1 of the present invention will be described. In the present embodiment, a four-direction blow-out type ceiling cassette type indoor unit is exemplified as the air conditioner. FIG. 1 is a schematic diagram showing a cross-sectional configuration of an air conditioner according to this embodiment. FIG. 1 shows a cross section of the air conditioner taken along the meridian plane of the turbofan 10. Here, the meridian plane is a plane including the axis O of the turbofan 10. The shape of the blade 15 shown in FIG. 1 and FIGS. 2 to 8 described later is one in which a plurality of blades 15 are rotationally projected on the meridian plane of the turbofan 10.

As shown in FIG. 1, the air conditioner includes a turbofan 10 having an impeller 11 and a fan motor 12 that drives the impeller 11, a heat exchanger 20 arranged on the leeward side of the impeller 11, and a turbofan. A housing 21 that houses the heat exchanger 10 and the heat exchanger 20 is provided. The fan motor 12 of the turbofan 10 is fixed to the central portion of the top surface of the housing 21. The axis O of the turbofan 10 extends vertically. The heat exchanger 20 is arranged so as to surround the outer circumference of the impeller 11, and has a frame shape that is substantially quadrangular when viewed in the direction along the axis O. The heat exchanger 20 constitutes a refrigeration cycle for circulating a refrigerant together with a compressor, an outdoor heat exchanger, and an expansion valve, which are not shown. The heat exchanger 20 functions as an evaporator during cooling operation and as a condenser during heating operation.

At the center of the lower surface of the housing 21, a suction port 22 of the air conditioner that sucks indoor air into the housing 21 is formed. Around the suction port 22 on the lower surface of the housing 21, an air conditioner outlet 23 is formed that blows the conditioned air that has passed through the heat exchanger 20 from the inside of the housing 21 into the room. In the four-direction blow-out type ceiling cassette type indoor unit, four air outlets 23 for blowing the conditioned air in four different directions are provided.

The impeller 11 includes a main plate 13 connected to the drive shaft 12 a of the fan motor 12, a ring-shaped side plate 14 arranged to face the main plate 13, and a plurality of main plates 13 and 14 provided between the main plate 13 and the side plates 14. And wings 15. A suction port 16 of the impeller 11 is formed in the center of the side plate 14 and has a circular shape centered on the axis O. The suction port 16 of the impeller 11 is arranged to face the suction port 22 of the air conditioner. Between the suction port 22 of the air conditioner and the suction port 16 of the impeller 11, there is provided a bell mouth 18 for guiding the indoor air sucked from the suction port 22 to the suction port 16. An outlet 17 of the impeller 11 is formed on the outer peripheral portion of the impeller 11. The plurality of blades 15 are arranged at equal intervals or unequal intervals in the circumferential direction around the axis O. The plurality of blades 15 have the same shape. Details of the shape of the blade 15 will be described later.

When the impeller 11 rotates about the shaft center O by the driving force of the fan motor 12, the room air sucked into the housing 21 through the suction port 22 of the air conditioner is guided by the bell mouth 18 and the blades. It is sucked into the impeller 11 from the suction port 16 of the wheel 11. The indoor air sucked into the impeller 11 passes between the blades of two blades 15 adjacent to each other in the circumferential direction, and is blown to the outer peripheral side from the air outlet 17 of the impeller 11. The indoor air blown to the outer peripheral side of the impeller 11 passes through the heat exchanger 20 and is cooled or heated by heat exchange with the refrigerant to become conditioned air. The conditioned air is blown into the room from the air outlet 23 of the air conditioner.

FIG. 2 is an enlarged view showing the configuration of the blades 15 in the air conditioner according to the present embodiment. The vertical direction of FIG. 2 represents the axial direction along the axial center O of the turbofan 10 and the impeller 11. The left-right direction of FIG. 2 represents the radial direction of the turbofan 10 and the impeller 11. In the range shown in FIG. 2, the left direction represents the radially outer side, and the right direction represents the radially inner side.

As shown in FIG. 2, the blade 15 has an upper end portion 32 joined to the lower surface of the main plate 13 and a lower end portion 33 joined to the upper surface of the side plate 14. In addition, the blade 15 has a leading edge 30 and a trailing edge 31 arranged rearward of the leading edge 30 in the rotation direction of the impeller 11. The rear edge 31 is arranged outside the front edge 30 in the radial direction. Both the leading edge 30 and the trailing edge 31 extend from the upper end portion 32 to the lower end portion 33. Hereinafter, the end portion on the upper end portion 32 side and the end portion on the lower end portion 33 side of the trailing edge 31 may be referred to as a main plate side end portion 31a and a side plate side end portion 31b, respectively.

One notch 34 having a substantially triangular shape is formed in a part of the trailing edge 31. That is, the notch 34 has a shape that is cut out in a substantially triangular shape from the rear edge 31 toward the front edge 30. The blades 15 are a pair of sides facing each other across the notch 34, and are a first side 35 a located on the main plate 13 side of the notch 34 in the axial direction and a side plate 14 more than the notch 34 in the axial direction. And a second side 35b located on the side. The range of the notch 34 is from the first connection point 37 where the first side 35a and the trailing edge 31 are connected to the second connection point 38 where the second side 35b and the trailing edge 31 are connected.

A portion of the notch 34 located on the innermost side in the radial direction is a bottom portion 36 of the notch 34. The bottom portion 36 is located between the first connection point 37 and the second connection point 38 in the axial direction. That is, the bottom portion 36 is located between a plane that is perpendicular to the axial direction and that includes the first connection point 37, and a plane that is perpendicular to the axial direction and that includes the second connection point 38. The first side 35a connects between the first connection point 37 and the bottom portion 36. The second side 35b connects between the second connection point 38 and the bottom portion 36. Since the notch 34 of this embodiment has a substantially triangular shape, the bottom portion 36 has a dot shape.

The depth dimension D1 of the notch 34 in the radial direction is defined as the distance between the second connection point 38 and the bottom portion 36 in the radial direction. That is, the depth dimension D1 is equal to the value obtained by subtracting the distance between the bottom portion 36 and the axis O from the distance between the second connection point 38 and the axis O. The width dimension W1 of the notch 34 in the axial direction is defined as the distance between the first connection point 37 and the second connection point 38 in the axial direction. The depth dimension D1 is larger than the width dimension W1 (D1>W1). The depth dimension D1 is ¼ or more of the distance between the front edge 30 and the rear edge 31 in the radial direction.

The second side 35b is formed in a smooth curved shape that is convex toward the main plate 13 side over the whole. That is, the second side 35b is formed so as to be convex with respect to the notch 34. The second side 35b has, for example, an arc shape.

Further, the first side 35a is formed in a smooth curved shape that is convex toward the main plate 13 side over the whole. That is, the first side 35 a is formed to be concave with respect to the notch 34. The first side 35a has, for example, an arc shape.

Similar to FIG. 2, FIG. 3 is an enlarged view of the configuration of the blades 15 in the air conditioner according to the present embodiment. As shown in FIG. 3, the notch 34 is formed in the rear edge 31 near the main plate 13. Specifically, when the virtual plane located in the middle between the main plate side end 31a and the side plate side end 31b of the trailing edge 31 in the axial direction is the first plane P1, the bottom 36 of the notch 34 is It is located closer to the main plate 13 than the first plane P1. Here, the first plane P1 is a plane perpendicular to the axial direction, and the distance from the main plate side end 31a is equal to the distance from the side plate side end 31b.

FIG. 4 is a diagram showing a positional relationship between the blades 15 and the heat exchanger 20 in the air conditioner according to the present embodiment. As shown in FIG. 4, the heat exchanger 20 is arranged not on the side of the main plate 13 but on the side plate 14 with respect to the outlet 17 of the turbofan 10. Specifically, when a virtual plane located midway between the upper end portion 20a and the lower end portion 20b of the heat exchanger 20 in the axial direction is the second plane P2, the second plane P2 is the first plane. It is located closer to the side plate 14 than P1. Here, the second plane P2 is a plane perpendicular to the axial direction, and is also a plane having the same distance from the upper end portion 20a and the lower end portion 20b. Since the bottom portion 36 of the cutout 34 is located closer to the main plate 13 side than the first plane P1, it is naturally located closer to the main plate 13 side than the second plane P2.

When the impeller 11 rotates, the blades 15 act so as to push air on the pressure side and draw air on the suction side. This effect is the same around the notch 34. The air reaching the bottom portion 36 of the notch 34 from the leading edge 30 along the blade surface on the pressure surface side or the suction surface side of the blade 15 is trailing edge from the bottom portion 36 along the first side 35a or the second side 35b. It flows to the 31st side.

In the turbo fan 10, since air is sucked from the suction port 16 into the impeller 11 along the axial direction, the air sucked into the impeller 11 moves in the axial direction from the side plate 14 to the main plate 13. Have momentum. Therefore, the air flowing along the blade surface of the blade 15 gradually approaches the main plate 13 from the front edge 30 toward the bottom portion 36, as indicated by the thick arrow F1 in FIG. However, since the second side 35b is formed to be convex toward the main plate 13, the air flow direction from the bottom portion 36 to the trailing edge 31 along the second side 35b is indicated by the thick arrow F2 in FIG. As shown in FIG. 7, the side plate 14 is gradually bent toward the trailing edge 31.

Further, since the first side 35a is also formed to be convex toward the main plate 13, the air flow direction from the bottom portion 36 to the trailing edge 31 along the first side 35a also gradually becomes closer to the trailing edge 31. It is bent to the side plate 14 side.

The flow of air flowing between the blades of two blades 15 adjacent to each other in the circumferential direction follows the flow of air along the blade surface of the blade 15. Therefore, the air flow direction on the outer peripheral side of the bottom portion 36 of the notch 34 is bent toward the side plate 14 side as a whole with respect to the air flow direction on the inner peripheral side of the bottom portion 36.

Therefore, since the notch 34 is formed in the trailing edge 31 of the blade 15, the air volume distribution of the air blown out from the air outlet 17 of the impeller 11 becomes more uniform, and the air volume distribution in the axial direction is closer to the main plate 13 side. The bias toward As a result, the deviation of the air volume distribution of the air flowing into the heat exchanger 20 is also alleviated. Therefore, according to the present embodiment, it is possible to reduce the loss of the dynamic pressure generated in the air from being blown out from the outlet 17 of the impeller 11 to flowing into the heat exchanger 20. Therefore, it is possible to obtain an air conditioner that requires less power and is excellent in energy saving.

Next, a modified example of the present embodiment will be described. FIG. 5: is a figure which shows the 1st modification of the structure of the blade|wing 15 in the air conditioner which concerns on this Embodiment. As shown in FIG. 5, a substantially trapezoidal notch 34 is formed in the trailing edge 31 of the blade 15 of this modification. The bottom portion 36 is formed in a straight line along the axial direction. Other configurations are the same as the configurations shown in FIGS. 1 to 4. Even with the configuration of the present modification, the air that has reached the bottom portion 36 of the notch 34 from the leading edge 30 along the blade surface of the blade 15 moves from the bottom portion 36 along the first side 35a or the second side 35b. It flows to the trailing edge 31 side. Therefore, the same effects as those of the configuration shown in FIGS. 1 to 4 can be obtained by this modification as well.

FIG. 6 is a diagram showing a second modified example of the configuration of blades 15 in the air conditioner according to the present embodiment. As shown in FIG. 6, an R portion 35a1 is formed in a portion of the first side 35a adjacent to the first connection point 37. An R portion 35b1 is formed in a portion of the second side 35b adjacent to the second connection point 38. Also in this configuration, the range of the notch 34 is from the first connection point 37 to the second connection point 38. The first side 35a is formed in a smooth curved shape that is convex toward the main plate 13 substantially over the entire portion except the R portion 35a1. The second side 35b is formed in a smooth curved shape that is convex toward the main plate 13 side over the entire portion including the R portion 35b1. According to this modification, the same effect as that of the configuration shown in FIGS. 1 to 4 can be obtained.

As described above, the air conditioner according to the present embodiment includes the turbofan 10 having the impeller 11 and the fan motor 12 that drives the impeller 11, and the heat exchange arranged on the leeward side of the impeller 11. And a container 20. The impeller 11 includes a main plate 13 connected to the drive shaft 12 a of the fan motor 12, a side plate 14 that is arranged to face the main plate 13, and has a suction port 16 formed in the center, and the main plate 13 and the side plate 14. And a plurality of blades 15 provided therebetween. Each of the plurality of blades 15 has a leading edge 30 and a trailing edge 31 arranged outside the leading edge 30 in the radial direction of the turbofan 10. A notch 34 is formed in the trailing edge 31. Each of the plurality of blades 15 is a pair of sides facing each other across the notch 34, and is a first side 35 a located on the main plate 13 side of the notch 34 and a second side 35 a located on the side plate 14 side of the notch 34. And a side 35b. The second side 35b is formed so as to be convex toward the main plate 13 side.

According to this configuration, the air flow direction along the second side 35b can be bent to the side plate 14 side, so that the deviation of the air volume distribution of the air flowing into the heat exchanger 20 can be mitigated. Therefore, it is possible to reduce the loss of the dynamic pressure generated in the air from being blown out from the impeller 11 to flowing into the heat exchanger 20, so that it is possible to obtain an air conditioner that requires less power and is excellent in energy saving.

In the air conditioner according to the present embodiment, one of the two ends of the trailing edge 31 located on the main plate 13 side is a main plate side end 31a, and the other one of the two ends of the trailing edge 31 located on the side plate 14 side. Is a side plate side end 31b, and a plane perpendicular to the axial direction of the turbofan 10 and having the same distance from the main plate side end 31a and the side plate side end 31b is the first plane. A portion of the notch 34 that is located on the innermost side in the radial direction of the turbofan 10 is a bottom portion 36 of the notch 34. At this time, the bottom portion 36 of the notch 34 is located closer to the main plate 13 than the first plane P1. According to this configuration, since the notch 34 is formed at a position where the air volume is relatively large, it is possible to effectively alleviate the deviation of the air volume distribution of the air flowing into the heat exchanger 20.

In the air conditioner according to the present embodiment, one end portion (for example, the upper end portion 20a) of the heat exchanger 20 in the axial direction is the first end portion, and the other end portion (for example, the heat exchanger 20 in the axial direction) (for example, , The lower end portion 20b) as a second end portion, and a plane perpendicular to the axial direction and having the same distance from the first end portion and the second end portion is referred to as a second plane P2. .. At this time, the second plane P2 is located closer to the side plate 14 than the first plane P1. With such a configuration, the deviation of the air volume distribution of the air flowing into the heat exchanger 20 in the axial direction is further larger than the deviation of the air volume distribution in the axial direction of the air outlet 17 of the impeller 11. Therefore, by mitigating the unevenness of the air flow distribution by the notch 34, it is possible to significantly reduce the loss of the dynamic pressure generated in the air from being blown out from the impeller 11 to flowing into the heat exchanger 20.

In the air conditioner according to the present embodiment, the depth dimension D1 of the notch 34 in the radial direction of the turbofan 10 is larger than the width dimension W1 of the notch 34 in the axial direction of the turbofan 10. According to this configuration, since the radial length of the second side 35b can be sufficiently secured, the air flow direction along the second side 35b can be bent more reliably.

In the air conditioner according to the present embodiment, the first side 35a is formed so as to be convex toward the main plate 13 side. According to this configuration, not only the air flow direction along the second side 35b but also the air flow direction along the first side 35a can be bent toward the side plate 14, so that the air flowing into the heat exchanger 20 can be prevented. It is possible to more surely alleviate the bias in the air flow distribution.

Embodiment 2.
An air conditioner according to Embodiment 2 of the present invention will be described. FIG. 7: is a figure which shows the structure of the blade|wing 15 in the air conditioner which concerns on this Embodiment. As shown in FIG. 7, the trailing edge 31 of the blade 15 is formed with a notch group 39 composed of a plurality of notches 39a, 39b, 39c, 39d juxtaposed in the axial direction. Each of the notches 39a, 39b, 39c, 39d has the same shape as the notch 34 shown in FIGS. 2 and 3. The notches 39a, 39b, 39c, 39d are arranged in this order from the main plate 13 side to the side plate 14 side.

The connection point at which the first side 35a of the notch 39a located closest to the main plate 13 side of the notch group 39 and the trailing edge 31 are connected is an end portion 40 of the notch group 39 on the main plate 13 side. .. A connection point at which the second side 35b of the notch 39d located closest to the side plate 14 in the notch group 39 and the rear edge 31 are connected to each other is an end portion 41 of the notch group 39 on the side plate 14 side. .. Further, an imaginary plane located in the middle of the ends 40 and 41 in the axial direction is referred to as a third plane P3. At this time, the third plane P3 is located closer to the main plate 13 than the first plane P1. Here, the third plane P3 is a plane that is perpendicular to the axial direction, and that the distance from the end 40 is equal to the distance from the end 41.

As described above, in the air conditioner according to the present embodiment, the trailing edge 31 is formed with the notch group 39 including the plurality of notches 39a, 39b, 39c, 39d. A plane perpendicular to the axial direction of the turbofan 10 and having the same distance from the main plate side end 31a and the side plate side end 31b is referred to as a first plane P1. A third plane is a plane perpendicular to the axial direction and in which the distance from the end 40 on the main plate 13 side of the cutout group 39 and the distance from the end 41 on the side plate 14 side of the cutout group 39 are equal. Let the plane be P3. At this time, the third plane P3 is located closer to the main plate 13 than the first plane P1.

According to this configuration, the notch group 39 is formed in the blade 15 over a wide area near the main plate 13 in the axial direction. Therefore, the effect of bending the air flow direction toward the side plate 14 side by the notches 39a, 39b, 39c, 39d is obtained for the air flow passing through the wide range of the blade 15 in the axial direction. Therefore, it is possible to effectively alleviate the deviation of the air volume distribution of the air flowing into the heat exchanger 20.

Embodiment 3.
An air conditioner according to Embodiment 3 of the present invention will be described. FIG. 8: is a figure which shows the structure of the blade|wing 15 in the air conditioner which concerns on this Embodiment. As shown in FIG. 8, a plurality of recesses 42 arranged in the axial direction are formed in the trailing edge 31 closer to the side plate 14 than the notch 34 in order to subdivide the trailing edge discharge vortex. As a result, the trailing edge 31 closer to the side plate 14 than the notch 34 has a sawtooth shape. The recess 42 is not formed in the rear edge 31 of the main plate 13 side of the notch 34. That is, the concave portion 42 is formed only on the side plate 14 side of the rear edge 31 with respect to the notch 34. The recess 42 is formed in the entire area of the trailing edge 31 on the side plate 14 side of the notch 34.

The depth dimension D2 of the recess 42 in the radial direction is equal to or less than the width dimension W2 of the recess 42 in the axial direction (D2≦W2). The width dimension W2 of the recess 42 in the axial direction is smaller than the width dimension W1 of the notch 34 (see FIG. 2) (W2<W1). The depth dimension D2 of the recess 42 in the radial direction is smaller than the depth dimension D1 of the notch 34 (see FIG. 2) (D2<D1).

As described above, in the air conditioner according to the present embodiment, the plurality of recesses 42 are formed in the trailing edge 31 on the side plate 14 side of the notch 34. The width W2 of each of the plurality of recesses 42 in the axial direction of the turbofan 10 is smaller than the width W1 of the notch 34 in the axial direction. The depth dimension D2 of each of the plurality of recesses 42 in the radial direction of the turbofan 10 is smaller than the depth dimension D1 of the notch 34 in the radial direction.

When the air flow direction is bent toward the side plate 14 side by the notch 34, the wind speed of the air at the side plate 14 side becomes relatively faster than at the notch 34. In the configuration of the present embodiment, since the plurality of recesses 42 are formed in the trailing edge 31 on the side plate 14 side of the notch 34, that is, in the portion where the wind velocity of air is relatively faster, The emitted trailing edge ejection vortices can be effectively subdivided. Therefore, the noise of the turbo fan 10 and the air conditioner can be reduced.

The above embodiments can be implemented in combination with each other.

10 turbofan, 11 impeller, 12 fan motor, 12a drive shaft, 13 main plate, 14 side plate, 15 blades, 16 inlet, 17 outlet, 18 bell mouth, 20 heat exchanger, 20a upper end, 20b lower end, 21 housing, 22 suction port, 23 air outlet, 30 front edge, 31 rear edge, 31a main plate side end, 31b side plate side end, 32 upper end, 33 lower end, 34 notch, 35a first side, 35b 2nd side, 35a1, 35b1 R part, 36 bottom part, 37 1st connection point, 38 2nd connection point, 39 Notch group, 39a, 39b, 39c, 39d Notch, 40, 41 End part, 42 Recessed part, O Axial center, P1 first plane, P2 second plane, P3 third plane.

Claims (7)

A turbofan having an impeller and a fan motor for driving the impeller;
A heat exchanger arranged on the leeward side of the impeller;
The impeller is
A main plate connected to the drive shaft of the fan motor,
A side plate disposed opposite to the main plate and having a suction port formed in the center,
A plurality of wings provided between the main plate and the side plate,
Each of the plurality of blades has a leading edge and a trailing edge arranged outside the leading edge in the radial direction of the turbofan,
A notch is formed in the trailing edge,
Each of the plurality of blades is a pair of sides facing each other across the notch, and a first side located on the main plate side of the notch and a second side located on the side plate side of the notch. And have
The air conditioner in which the second side is formed to be convex toward the main plate. Of the both ends of the trailing edge, the end located on the main plate side is the main plate side end,
Of the both end portions, the end portion located on the side plate side is the side plate side end portion,
A plane that is a plane perpendicular to the axial direction of the turbofan and has a distance from the main plate side end and a distance from the side plate side end that are equal to each other,
When the innermost portion of the notch in the radial direction of the turbofan is the bottom of the notch,
The air conditioner according to claim 1, wherein the bottom portion is located closer to the main plate than the first plane. One end of the heat exchanger in the axial direction is a first end,
The other end of the heat exchanger in the axial direction is the second end,
When a plane perpendicular to the axial direction and having a distance from the first end and a distance from the second end equal to each other is a second plane,
The air conditioner according to claim 2, wherein the second plane is located closer to the side plate than the first plane. The air conditioner according to any one of claims 1 to 3, wherein a depth dimension of the notch in a radial direction of the turbo fan is larger than a width dimension of the notch in an axial direction of the turbo fan. Machine. The air conditioner according to any one of claims 1 to 4, wherein the first side is formed so as to be convex toward the main plate. On the rear edge, a notch group consisting of a plurality of the notches is formed,
A plane that is a plane perpendicular to the axial direction of the turbofan and has a distance from the main plate side end and a distance from the side plate side end that are equal to each other,
A third plane is a plane perpendicular to the axial direction and in which the distance from the main plate side end of the notch group and the distance from the side plate side end of the notch group are equal. And when
The air conditioner according to any one of claims 1 to 5, wherein the third plane is located closer to the main plate than the first plane. A plurality of recesses are formed on the side plate side of the rear edge with respect to the notch,
The width dimension of each of the plurality of recesses in the axial direction of the turbofan is smaller than the width dimension of the notch in the axial direction,
The air conditioner according to any one of claims 1 to 6, wherein a depth dimension of each of the plurality of recesses in the radial direction of the turbofan is smaller than a depth dimension of the notch in the radial direction. Machine.

Images